⬆️(project) upgrade geoalchemy2 to v0.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
geoalchemy2 (source)	==0.15.0 -> ==0.15.1

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Release Notes

geoalchemy/geoalchemy2 (geoalchemy2)

### [`v0.15.1`](https://togithub.com/geoalchemy/geoalchemy2/blob/HEAD/CHANGES.txt#0151) [Compare Source](https://togithub.com/geoalchemy/geoalchemy2/compare/0.15.0...0.15.1) - Fix: Default SRID is bypassed when using floating point coordinates [@​aballet](https://togithub.com/aballet) ([#​509](https://togithub.com/geoalchemy/geoalchemy2/issues/509)) - Test: Dispose of the connection pools of the test engines [@​adrien-berchet](https://togithub.com/adrien-berchet) ([#​511](https://togithub.com/geoalchemy/geoalchemy2/issues/511))

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